Process for the exchange of ions adsorbed by colloids.



BOTHO SCHWERIN, OI ERANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR TO ELEKTBO- GSMOSE AKTIENGESELLSCHAFT, (GRAF SCHWERIN GESELLSCHAF'L) OI? FRANK- FOBT-ON-THE-MAIN, GERMANY, A GORPORATION.

PROCESS FOR THE EXCHANGE-50F IONS ADSORBED. BY coLLoIns.

Ho Drawing;

"To all 'uihom it may concern:

Be it known that I, Bo'rHo Scnwnnm, a

' subject of the German Emperor, residing at Frankfort-on-the-Main, Germany, have 1n- 5 vented certain new and usefulImprove- Specification of Letters Patent.

Patented Dec. 8, 1914.

g Application filed April 24. 1914. Serial No. 834,266.

E. Ebler of Heidelberg, is thoroughl washed with boiling water and filtere The adsorption is now treated with a solution of grams of aluminium chlorid per liter, six times in succession in the follow- .ments in Processes for the Exchan e of ing manner :-The adsorption compound is Ions Adsorbed by Colloids, of whic the held suspended with aid of a stirrer, for afollowing is a specification. long time in 1000 c. c. of the aforesaid solu- It is known that certain colloids adsorb tion, then the whole is boiled with continued 10 ions from solutions of salts. Electronegastirring and finally filtered, the residue on tive colloids adsorb-basic ions, while electrothe filter being washed with water. Quanpositive colloids adsorb acid ions, and it is titative estimation of the radium and bariknown that thisadsorption may be selective. um in the ori inal adsorption compound,

It is also known that such adsorptions may in thetotal was ings and in the final manga- 15 be deadsorbed by the electric current and nese peroxid adsorption, shows that a part simultaneously fractionatedso that the adof the barium and radium adsorbed in the sorbed matters are liberated and recovered. manganese peroxid has been deadsorbed By the present invention ions adsorbed in and the" relationship between the barium this manner may be exchanged for other and the" radium has been changed; ex-

20 ions by treating the adsorption compound pressed in percentages the new relationship with solutions of electrolytes. Tl'llS exis as follows change can be made selective by suitable Radium Barium 'choice of salt solution and concentration Original adsorption com oundnmnhh. 10o 10o thereof, so that fractionation of ions 5323iXiitfifiiaaaaatiaaaiaxitxft ii? iii 25 can be achieved. This method is "importantin all cases in which it is desired to sepa- The cohcehtl'ahoh of th l m h rate and to isolate such substances as, for respect the h h fldsorhed Wlth instance, closely related elements or rare amhuhted 1n the hg adsor ,tlon earths, Whose chemical behavior is so nearly Pound x P f 111m metal,

30 identical that they can be separated from Whereas final Product 1h 15 6-95X1O"4 each other only with difficulty. P centradhim metal Solutions of electrolytes to be used in this The followhlg exhmplh W111 also serve to invention are preferably neutral or acid llhlshate the h hh g P solutions of salts. In the case of electro- "1011mm chlohld r (,hssolved m hter of 35 negative colloids an exchange of bases may Water- In thls Solutloh are P 10 be efiected, and an exchange-of acid residues gl h of a manganese P harlum'm in the case of electropositive' colloids, and it (hum; adsorptloh compound of k 9 has been found that the strongest electrotent 111 a Q TY h State of subdlvlsloh and positive bases exhibit inhighest degree the whole 15 honed some mlnlltes- In 40 tendency to exchange with other bases. The the fi1tere d Shd matter there h Preseht potential series permits apparently very f the g y adsorbed hanum and great variation. chum,

When it has been ascertained which salt 333w; gi gqe r solution may be best used for de-adsorption 45-this solution may advantageously be used In the adsorption compound the radiumv for selective adsorption. In this manner it barium concentration was 1.66 10- per is possible to insure that the ion which is to cent. radium metal. After de-adsorption it be de-adsorbed is adsprbed only in small deamounted to 3.26X10 per cent. radlum gree and thus the filrther de-adsorption in metal.

50 accordance with this invention becomes Having now described the nature of my said invention and the best means I know of I more easy.

As an example of the invention, a manganese peroxid barium radlum adsor tion made in the manner prescribed by Pro essor carrying the same into practical effect, I

claim v 1. A process for the exchange of ions adsorbedeby colloids, which process consists in tion of an electrolyte which effects a 'selec- 10 treating the colloid adsorption with a suittive exchange of the ions.

able solution of an electrolyte for the pur- In'testimony whereof I afiix my signapose of isolating and separating substances ture in presence of two witnesses;

which can be chemically separated only with BQTHO SGHWERIN 2. A process for the exchange of ions ad- Witnesses: sorhed by colloids, which process consists in v JEAN GRUND, treating the colloid-adsorption with a solu- HEATON 'W. I-Lmms. 

